Calculators that respond to their environment. All of the financial calculators here at CalcXML have been designed following responsive web design principles, adapting to the size of the screen on which they are displayed. From the smallest cell phone to the largest desktop monitor, all of your web visitors will be happy with these financial calculators.
Dichlorodiphenyltrichloroethane (DDT) Dichlorodiphenyltrichloroethane (DDT) is an insecticide used in agriculture. The United States banned the use of DDT in 1972, but some countries still use the chemical.
In some cases, DDT production even increased(44). ** DDT was banned in the US in 1972, except for public health emergencies. Small amounts were used until 1980(45). In 1991, the US exported 92 tons of DDT(46).